Bismuth-catalyzed polyurethane composition

a polyurethane composition and bismuth technology, applied in the preparation of isocyanic acid derivatives, physical/chemical process catalysts, organic compounds/hydrides/coordination complex catalysts, etc., can solve the problem of low composition ultimate mechanical strength, the catalytic activity of bismuth compounds in respect of isocyanate/water reaction is much lower than the one of bismuth compounds

Active Publication Date: 2006-08-17
SIKA TECH AG
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AI Technical Summary

Problems solved by technology

This effect is very pronounced particularly under adverse application conditions, such as low temperature or low atmospheric moisture, for instance, and in such cases leads frequently to incomplete curing and hence to low ultimate mechanical strength in the composition.
Tin catalysts of this kind, however, have recently come under increasing pressure from users on account of toxicological concerns.
However, the catalytic activity of bismuth compounds in respect of the isocyanate/water reaction is much lower than that of tin catalysts.
The high catalyst dose needed for a sufficient cure rate means, however, that polyurethane compositions comprising such bismuth carboxylates do not remain usable over the entire shelf-life period required by the user, generally several months up to one or two years, since the isocyanate groups in the composition undergo reactions under the effect of the bismuth catalyst, even in the absence of water.
The inadequate storage stability of...

Method used

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  • Bismuth-catalyzed polyurethane composition
  • Bismuth-catalyzed polyurethane composition
  • Bismuth-catalyzed polyurethane composition

Examples

Experimental program
Comparison scheme
Effect test

examples 27-35

[0057] Bismuth tris(neodecanoate) in neodecanoic acid (NeoBi 200, Shepherd Chemicals; bismuth content 20.0% by weight) and a compound L of denticity Z in the stated molar ratio L×Z / Bi according to Table 3 were charged to a glass flask and diluted with diisodecyl phthalate to a total bismuth content of formally 2.0% by weight. The mixture was placed under dry nitrogen and heated at 100° C. with vigorous stirring for one hour. The resulting catalyst solution was cooled and then mixed into the isocyanate-terminated polyurethane prepolymer described in Example 1, in an amount of 3.0% by weight (i.e., formally, 0.06% by weight of bismuth) per 100% by weight of prepolymer, and the mixtures were stored and tested as described in Example 1. The results of the tests performed are set out in Table 3.

[0058] The results in Table 3 show that the inventive compositions of Examples 7 and 27 to 35 (each comprising an inventive bismuth catalyst system), when set against Comparative Example 10 (comp...

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Abstract

The present invention relates to a one-component polyurethane composition comprising at least one polyurethane prepolymer having terminal isocyanate groups which is prepared from at least one polyisocyanate and at least one polyol, and to at least one catalyst system which is obtainable from at least one bismuth compound and at least one aromatic nitrogen compound. The invention additionally relates to a use of this polyurethane composition as an adhesive, sealant, coating or lining. Finally, catalysts for polyurethane compositions are disclosed which represent coordination compounds between bismuth and at least one aromatic nitrogen compound.

Description

TECHNICAL FIELD [0001] The present invention relates to the field of polyurethane compositions and also catalysts for polyurethane compositions. PRIOR ART [0002] Polyurethane compositions have been used for a long time in many sectors. On the one hand, two-component polyurethane compositions are known, which comprise isocyanates in one component and in the second component an isocyanate-group-reactive compound such as an amine for example. Systems of this kind are distinguished by extremely rapid curing after the components have been mixed. On the other hand, one-component polyurethane compositions are also known. These polyurethane compositions comprise reactive isocyanates and cure under the influence of water. The water for this purpose originates normally from the air (atmospheric moisture). Governed by the diffusion of the water, the curing of these compositions following their application takes place significantly more slowly than in the case of two-component systems. This eff...

Claims

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Application Information

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IPC IPC(8): C08G18/00B01J31/18C08G18/12C08G18/22C08G18/30C08G18/48C09D175/04C09J175/04
CPCB01J31/1805C08G18/12C08G18/227C08G18/4866C08G2190/00C09D175/04C08G18/307
Inventor BURCKHARDT, URSDIENER, ANDREAS
Owner SIKA TECH AG
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